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TECHNICAL PAPERS

An Experimental Study on the Seismic Response of Base-Isolated Secondary Systems

[+] Author and Article Information
Hany Khechfe

Ratomag Corporation, Mirghany, Heliopolis, Cairo, Egypt

Mohammad Noori

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695 e-mail: mohammad_noori@ncsu.edu

Zhikun Hou

Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609

James M. Kelly

Department of Civil Engineering, University of California, Berkeley, CA 94804

Goodarz Ahmadi

Department of Mechanical and Aerospace Engineering, Clarkson University, Potsdam, NY 13766

J. Pressure Vessel Technol 124(1), 81-88 (Nov 29, 2001) (8 pages) doi:10.1115/1.1445795 History: Received May 18, 2001; Revised November 29, 2001
Copyright © 2002 by ASME
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References

Kelly,  J. M., and Tsai,  H. C., 1988, “Seismic Response of The Superstructure and Attached Equipment in a Base Isolated Building,” Earthquake Eng. Struct. Dyn., 18, pp. 551–564.
Su,  L., Ahmadi,  G., and Tadjbakhsh,  I., 1989, “A Comparative Study of Performances of Various Base Isolation Systems. Part I: Shear Beam Structures,” Earthquake Eng. Struct. Dyn., 8, 11–32.
Ahmadi, G, Fan, F. G., and Tadjbakhsh, I., 1988, “Base Isolation of a Multi-Story Building Under a Harmonic Ground Motion—A Comparison of Performances of Various System,” Report No. NCEER-88-0010, State University of New York at Buffalo, Vol. 3.
Kelly,  J. M., 1986, “A Seismic Base Isolation: Review and Bibliography,” Soil Dyn. Earthquake Eng., 5, pp. 202–217.
Buckle,  I. C., and Mayes,  R. L., 1990, “Seismic Isolation: History, Application and Performance—a World Overview,” Earthquake Spectra, 6, pp. 161–202.
Nagarajaiah, S., Reinhorn, A. M., and Constantinou, M. C., 1991, “3D-BASIS: Nonlinear Dynamic Analysis of Three-dimensional Base Isolated Structures: Part II,” Report No. NCEER-91-0005, National Center for Earthquake Engineering Research, State University of New York at Buffalo, NY.
Ahmadi,  G., and Mostaghel,  N., 1984, “On Dynamics of a Structure with a Frictional Foundation,” J. Mec. Theor. Appl., 3, pp. 271–285.
Mostaghel,  N., and Tanbakuchi,  I., 1983, “Response of Sliding Structure to Earthquake Support Motion,” Earthquake Eng. Struct. Dyn., 11, pp. 729–748.
Chen,  Y., and Soong,  T. T., 1988, “STATE-OF-THE-ART Seismic Response of Secondary Systems,” Eng. Struct., 10, pp. 12–30.
Kelly, J. M., and Tsai, H. C., 1989, “Non-Classical Damping in Dynamic Analysis of Base Isolated Structures with Internal Equipment,” Earthquake Eng. Struct. Dyn.
Kelly, J. M., 1982, “The Influence of Base Isolation on The Seismic Response of Light Secondary Equipment,” UCB/EERC-81/17, Berkeley, CA.
Igusa,  T., and Der Kiureghian,  A., 1985, “Dynamic Characterization of Two Degree-of-freedom Equipment Structure Systems,” J. Eng. Mech., Am. Soc. Civ. Eng., 109, pp. 1–19.
Der Kiureghian,  A., Sackman,  J. L., and Omid,  B. Nour, 1983, “Dynamic Analysis of Light Equipment in Structures: Response to Stochastic Input,” J. Eng. Mech. Div., Am. Soc. Civ. Eng., 109, pp. 90–110.
Singh,  M. P., 1988, “Seismic Design of Secondary Systems,” Probab. Eng. Mech., 3, pp. 12–27.
Ghantous, G., 1991, “Seismic Response Analysis of Base lsolated Secondary Systems,” M.S. thesis, Advised by M. Noori, M E Dept., Worcester Polytech. Inst.,
Samaha, B. E., 1992, “Seismic Response of Base-Isolated Secondary Systems,” M.S. thesis, co-advised by El-Korchi, Z. Hou, and M. Noori, Worcester Polytech. Inst.
Hou, Z., Noori, M., Samaha, B., and Jacobson, K., 2001, “A Parametric Study on Seismic Response of Secondary Systems Using Base Isolations,” Earthquake Eng. Struct. Dyn., to appear.
Foss, J. W., and Nikolakopoulou, G. A., 1976, “Protecting Communications Equipment Against Earthquakes,” Proceedings of the US-Japan Seminar on Earthquake Engineering Research, Tokyo, Japan.
Kelly,  J. M., 1990, “Base Isolation: Linear Theory and Design,” Earthquake Spectra, 6, No. 2, pp. 223–244 California: Earthquake Engineering Research Institute (EERI).

Figures

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Mathematical models of base isolation systems
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Parameters of the isolated secondary system
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Mode shapes of the 2-DOE system
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Base isolated secondary system
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Schematic of the primary and secondary systems
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(a) Effect of base isolation on displacement and acceleration response histories of secondary system. (b) FFT of Secondary System Displacement in changing spring stiffness.
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(a) FFT of secondary system acceleration with changing base isolator mass. (b) FFT of secondary system displacement with changing base isolator mass.
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(a) Frequency response of secondary system acceleration in changing spring stiffness. (b) FFT of secondary system displacement in changing damping stiffness.

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